Idioms: The last straw

the final/last straw(also the straw that breaks the camel's back) C1 Levelthe last in a series of unpleasant events that finally makes you feel that you cannot continue to accept a bad situation:Losing my job was bad enough, but being evicted was the final straw.She's always been rude to me, but it was the last straw when she started insulting my mother.Source:https://dictionary.cambridge.org/dictionary/english/final-last-straw